Hands-On With PS4's PlayStation 2 Emulation
 

It wasn't announced with much fanfare, but many PS4 owners will be thrilled at the possibility of playing their favorite PS2 titles again on the newest Sony console. Here's a vid that provides a look at how some games look in comparison to their originals. Original PlayStation 2 titles ran at a range of pixel counts, but 512x448 and 640x448 were commonplace (God of War 2 even let you choose between the two). It's still early days in our analysis, but first impressions suggest that the emulator resolves a native resolution of 1292x896. Two black lines are added top and bottom to the image, before receiving a final upscale up to full 1080p. In effect, we're looking at around 4x the pixel count - possibly higher, depending on the title. Texture filtering also looks improved, but on close inspection we think that the increased quality is probably down to the extra resolution alone.

http://www.hardocp.com/news/2015/11/...n_2_emulation/